October, '19] 



PETERSON: APHID EGGS 



385 



Chart IV. Plotted lines showing the superiority of recommended liquid lime- 

 sulfur, 1-9 plus nicotine, 1-500 spray over other sprays ("Scalecide," hydrated 

 limo, fish oil soap, fish oil soap combined with nicotine and with crude carbolic 

 acid, linseed oil emulsion and cottonseed oil emulsion) in killing the eggs of 

 A. arenne. Observe the decided increase in the kiUing effect of each spray when 

 applied nearer the hatching period (or as the susceptil)ility of the eggs increases). 

 1918-1919. 



